mp3.h

ESS3890+SL原代码（1*16内存）

/* Copyright 1998, ESS Technology, Inc.                                 */
/* SCCSID @(#)mp3.h	4.5 02/17/05 */ 

GBLDEF(int MP3_enabled, 0);	/* 1: enable MP3, 0: disable MP3 */
GBLDEF0(int MPG_layer);         /* 3: MPEG layer III, 2: layer II */
GBLDEF(int MP3_framesize, 1000);/* "stable" framesize for real-time */
GBLDEF0(int mp3_time_elapsed);  /* how many seconds elapsed */
GBLDEF0(int MPG_frames);	/* number of frames have been played */
GBLDEF0(int MPG_last_cnt);
GBLDEF0(int PCM_framesize);
GBLDEF0(int MPG_cnt);           /* number of times TSK_decode_audio  */
                                        /* is called */


#define MP3_SECTOR_SIZE		512	/* 2048B data */ 

/* MP3 VBR related */
#define MP3_VBR_BASE 0x900		/* NOTE: "base" and "gain" limits    */
#define MP3_GAIN_MIN (1*MP3_VBR_BASE)	/* ABV_write < (base * gain)..       */

#if defined(ANTI_SHOCK) || !defined(MIC_RECORD) 
#define MP3_GAIN_MAX ((ABV_size>>2)+(ABV_size>>3))	/* ABV_size*3/8 */
#define MP3_ABV_FULLNESS_MIN	((ABV_size>>1)+(ABV_size>>3)) /* ABV_size*5/8 */
#else
#define MP3_GAIN_MAX			(ABV_size-MP3_ABV_FULLNESS_MIN)	
#define MP3_ABV_FULLNESS_MIN		(4*MP3_VBR_BASE) 
#endif
#define DEF_VBR_GAIN			(3*MP3_VBR_BASE)

#define MP3_ABV_FULLNESS_MAX		(MP3_ABV_FULLNESS_MIN + 5000)
#define MP3_ABV_FULLNESS_EMERGENCY	(50*ABV_write)
GBLDEF	 (int MP3_VBR_gain, DEF_VBR_GAIN); /* 1 < MP3_VBR_gain < 15 */

#ifdef TRACE_MP3_AUDIOBREAK
GBLDEF_0 (int MP3_is_decoding, 0);
GBLDEF_0 (int MP3_is_takeout, 0);
GBLDEF_0 (int MP3_system_crash, 0);
#endif

/* global functions */
extern void	MP3_time_elapsed(void);
extern unsigned int MP3_time2sectors(int);
extern unsigned int MP3_currCDtime(void);
extern void	MP3_VBR_gain_adjust(int);

#ifdef MP3_LOGO
extern void	play_mp3_logo(int *, int);
extern void	MP3_logo_start(void);
#endif